/* eslint-disable @typescript-eslint/no-explicit-any */
<template>
    <div class="file-upload">
        <div class="upload-area" :class="{ 'is-dragover': drag & isDragOver }" v-on="events">
            <slot v-if="isUploading" name="loading">
                <button disabled>正在上传</button>
            </slot>
            <slot
                name="uploaded"
                v-else-if="lastFileData && lastFileData.loaded"
                :uploadedData="lastFileData.data"
            >
                <button>点击上传</button>
            </slot>
            <slot v-else name="default">
                <button>点击上传</button>
            </slot>
        </div>
        <input
            ref="fileInput"
            type="file"
            :style="{ display: 'none' }"
            @change="handleFileChange"
        />
        <ul :class="`upload-list upload-list-${listType}`" v-if="showUploadList">
            <li
                :class="`uploaded-file upload-${file.status}`"
                v-for="file in filesList"
                :key="file.uid"
            >
                <img
                    v-if="file.url && listType === 'picture'"
                    class="upload-list-thumbnail"
                    :src="file.url"
                    :alt="file.name"
                />
                <span v-if="file.status === 'loading'" class="file-icon">
                    <LoadingOutlined />
                </span>
                <span v-else class="file-icon"><FileOutlined /></span>
                <span class="filename">{{ file.name }}</span>
                <span class="delete-icon" @click="removeFile(file.uid)"><DeleteOutlined /></span>
            </li>
        </ul>
    </div>
</template>
<script lang="ts">
import { computed, defineComponent, PropType, reactive, ref } from 'vue';
import { DeleteOutlined, LoadingOutlined, FileOutlined } from '@ant-design/icons-vue';
import axios from 'axios';
import { v4 as uuidv4 } from 'uuid';
import { last } from 'lodash-es';
type UploadStatus = 'ready' | 'loading' | 'success' | 'error';
type FileListType = 'picture' | 'text';
type CheckUpload = (file: File) => boolean | Promise<File>;
export interface UploadFile {
    uid: string;
    size: number;
    name: string;
    status: UploadStatus;
    raw: File;
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    resp?: any;
    url?: string;
}

export default defineComponent({
    components: {
        DeleteOutlined,
        LoadingOutlined,
        FileOutlined,
    },
    props: {
        action: {
            type: String,
            required: true,
        },
        beforeUpload: {
            type: Function as PropType<CheckUpload>,
        },
        drag: {
            type: Boolean,
            default: false,
        },
        autoUpload: {
            type: Boolean,
            default: true,
        },
        listType: {
            type: String as PropType<FileListType>,
            default: 'text',
        },
        showUploadList: {
            type: Boolean,
            default: true,
        },
    },
    emits: ['success', 'error', 'change'],
    setup(props, { emit }) {
        const fileInput = ref<null | HTMLInputElement>(null);
        const filesList = ref<UploadFile[]>([]);
        const isDragOver = ref(false);
        const isUploading = computed(() => {
            return filesList.value.some(file => file.status === 'loading');
        });
        const lastFileData = computed(() => {
            const lastFile = last(filesList.value);
            if (lastFile) {
                return {
                    loaded: lastFile.status === 'success',
                    data: lastFile.resp,
                };
            }
            return false;
        });
        const removeFile = (id: string) => {
            filesList.value = filesList.value.filter(file => file.uid !== id);
        };
        const triggerUpload = () => {
            if (fileInput.value) {
                fileInput.value.click();
            }
        };
        const postFile = (readyFile: UploadFile) => {
            const formData = new FormData();
            formData.append(readyFile.name, readyFile.raw);
            readyFile.status = 'loading';
            axios
                .post(props.action, formData, {
                    headers: {
                        'Content-Type': 'multipart/form-data',
                    },
                })
                .then(resp => {
                    readyFile.status = 'success';
                    readyFile.resp = resp.data;
                    emit('success', {
                        resp: resp.data,
                        file: readyFile,
                        list: filesList,
                    });
                })
                .catch(e => {
                    readyFile.status = 'error';
                    emit('error', {
                        error: e,
                        file: readyFile,
                        list: filesList.value,
                    });
                })
                .finally(() => {
                    if (fileInput.value) {
                        fileInput.value.value = '';
                    }
                });
        };
        const addFileToList = (uploadedFile: File) => {
            const fileObj = reactive<UploadFile>({
                uid: uuidv4(),
                size: uploadedFile.size,
                name: uploadedFile.name,
                status: 'ready',
                raw: uploadedFile,
            });
            if (props.listType === 'picture') {
                try {
                    fileObj.url = URL.createObjectURL(uploadedFile);
                } catch (err) {
                    console.error('upload file error', err);
                }
                // FileReader to preview local image
                // const fileReader = new FileReader()
                // fileReader.readAsDataURL(uploadedFile)
                // fileReader.addEventListener('load', () => {
                //   fileObj.url = fileReader.result as string
                // })
            }
            filesList.value.push(fileObj);
            if (props.autoUpload) {
                postFile(fileObj);
            }
        };
        const beforeUploadCheck = (files: null | FileList) => {
            if (files) {
                const uploadedFile = files[0];
                if (props.beforeUpload) {
                    const result = props.beforeUpload(uploadedFile);
                    if (result && result instanceof Promise) {
                        result
                            .then(processedFile => {
                                if (processedFile instanceof File) {
                                    addFileToList(processedFile);
                                } else {
                                    throw new Error(
                                        'before upload promise should return File object'
                                    );
                                }
                            })
                            .catch(e => {
                                console.error(e);
                            });
                    } else if (result === true) {
                        addFileToList(uploadedFile);
                    }
                }
            }
        };
        const uploadFiles = () => {
            filesList.value
                .filter(file => file.status === 'ready')
                .forEach(readyFile => {
                    postFile(readyFile);
                });
        };
        // eslint-disable-next-line @typescript-eslint/no-explicit-any
        let events: { [key: string]: (e: any) => void } = {
            click: triggerUpload,
        };
        const handleFileChange = (e: Event) => {
            const target = e.target as HTMLInputElement;
            beforeUploadCheck(target.files);
        };
        const handleDrag = (e: DragEvent, over: boolean) => {
            e.preventDefault();
            isDragOver.value = over;
        };
        const handleDrop = (e: DragEvent) => {
            e.preventDefault();
            isDragOver.value = false;
            if (e.dataTransfer) {
                beforeUploadCheck(e.dataTransfer.files);
            }
        };
        if (props.drag) {
            events = {
                ...events,
                dragover: (e: DragEvent) => {
                    handleDrag(e, true);
                },
                dragleave: (e: DragEvent) => {
                    handleDrag(e, false);
                },
                drop: handleDrop,
            };
        }
        return {
            fileInput,
            handleFileChange,
            isUploading,
            filesList,
            removeFile,
            lastFileData,
            isDragOver,
            events,
            uploadFiles,
        };
    },
});
</script>
<style lang="less">
.upload-list {
    margin: 0;
    padding: 0;
    list-style-type: none;
}
.upload-list li {
    transition: all 0.5s cubic-bezier(0.55, 0, 0.1, 1);
    font-size: 14px;
    line-height: 1.8;
    margin-top: 5px;
    box-sizing: border-box;
    border-radius: 4px;
    min-width: 200px;
    position: relative;
    &:first-child {
        margin-top: 10px;
    }
    .upload-list-thumbnail {
        vertical-align: middle;
        display: inline-block;
        width: 70px;
        height: 70px;
        position: relative;
        z-index: 1;
        background-color: #fff;
        object-fit: cover;
    }
    .file-icon {
        svg {
            margin-right: 5px;
            color: rgba(0, 0, 0, 0.45);
        }
    }
    .filename {
        margin-left: 5px;
        margin-right: 40px;
    }
    &.upload-error {
        color: #f5222d;
        svg {
            color: #f5222d;
        }
    }
    .file-status {
        display: block;
        position: absolute;
        right: 5px;
        top: 0;
        line-height: inherit;
    }
    .delete-icon {
        display: none;
        position: absolute;
        right: 7px;
        top: 0;
        line-height: inherit;
        cursor: pointer;
    }
    &:hover {
        background-color: #efefef;
        .file-status {
            display: none;
        }
        .delete-icon {
            display: block;
        }
    }
}
</style>
